12 places to escape the smog: the world's best car-free islands

Fadiouth, Senegal

“In what is probably one of the world’s most original recycling projects, the seafood-loving Senegalese have built an island out of millions of discarded mollusk shells,” says Telegraph Travel’s Gavin Haines. “Houses, pathways and even graveyards (pictured) are made from shells, which crunch under your feet wherever you walk in Fadiouth.”